class_docstr: Test cancel inverses on tape, qfunc and QNode.
docstr: Test the transform on a qnode directly.
docstr_tok: ["Test","the","transform","on","a","qnode","directly","."]
code: def test_qnode(self):
      """Test the transform on a qnode directly."""
      transformed_qnode = merge_rotations(qnode_circuit)
      assert not transformed_qnode.transform_program.is_empty()
      assert len(transformed_qnode.transform_program) == 1
      res = transformed_qnode([0.1, 0.2, 0.3, 0.4])
      exp_res = qnode_circuit([0.1, 0.2, 0.3, 0.4])
      assert np.allclose(res, exp_res)
  
imports: import pytest
  from utils import compare_operation_lists
  import pennylane
  from pennylane import numpy
  from pennylane.wires import Wires
  from pennylane.transforms.optimization import merge_rotations
label_desc: Use image node_id 3 for calling the TestTransformDispatch obj's underlying member method code with example usage: obj.test_qnode() without return types